The system must not apply reversed source routing to TCP responses.

From HP-UX 11.31 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-001551

SV-35028r1_rule The system must not apply reversed source routing to TCP responses.

Vulnerability discussion

Source-routed packets allow the source of the packet to suggest routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures.

Check content

Determine if the system is configured to forward source-routed IP packets. When correctly configured, if ip_forward_src_routed is disabled, the system is also configured to disable reverse source routing to TCP responses to source-routed packets. # ndd -get /dev/ip ip_forward_src_routed If the returned value is not '0', this feature is enabled and this is a finding.

Fix text

Disable the IP source-routed forwarding feature. # ndd -set /dev/ip ip_forward_src_routed 0 Edit /etc/rc.config.d/nddconf and add/set: TRANSPORT_NAME[x] = ip NDD_NAME[x] = ip_forward_src_routed NDD_VALUE[x] = 0

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